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Development of resistance to nymphs of Amblyomma cajennense ticks (Acari:Ixodidae) in dogs

Mukai, Luciana S.; Castro Netto, A.; Szabó, M. P J; Bechara, G. H.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 180-183
ENG
Relevância na Pesquisa
27.23%
Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A. cajennense by determining the tick alimentary performance after successive controlled infestations. Mean engorged weight of nymphs was not significantly different among the three infestations; molting rate from nymph to adult ticks, and the percentage of nymph recovery were also very close in all infestations. These results are similar to those obtained in studies of the dog-adult Rhipicephalus sanguineus interface. It is concluded that domestic dogs do not develop resistance against nymphs of A. cajennense ticks.

Estudo biológico e biométrico dos estádios ninfais de Rhodnius prolixus Stäl, 1859 (Hemiptera, Reduviidae) sob condições laboratoriais

Marconato, E.; Ponsoni, E. J.; Barata, J. M S; Da Rosa, João Aristeu
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 157-161
POR
Relevância na Pesquisa
26.95%
Eggs and nymphs originated from couples of Rhodnius prolixus obtained from nymphs of the 5th instar were used for biological cycle and biometric studies. The following biological cycle parameters were determined under a temperature of 28°C and relative humidity, varying between 52 - 94% : medium period of incubation: 13.01 days; rate of eggs eclosion: 77.6%; medium period of development of the 1st, 2nd, 3rd, 4 th, 5th instar nymphs : 19.33, 19.09, 20.38, 24.37, 38.14 days, respectively; percentual of deaths in the nymph instar: 26.70, 14.00, 18.26, 17.02, 35.47% respectively; percentual of changes per instar nymphs; 73.30, 86.03, 81.73, 82.97, 64.52%, respectively. Biometric measurements performed, showed that in all the instars the abdomen is the largest segment. In the four first instars, the head is larger than the thorax. In the fifth instar, the head and thorax present are about the same size.; A partir de ninfas de 5o estádio obtiveram-se casais de Rhodnius prolixus, que originaram ovos e ninfas para estudos de ciclo biológico e biométrico. Foram determinados os seguintes parâmetros do ciclo biológico à temperatura de 28OC e umidade relativa do ar variando entre 52 e 94%: período médio de incubação dos ovos: 13,01 dias; taxa de eclosão dos ovos: 77...

Morphological description of the nymphal stage of Amblyomma geayi and new nymphal records of Amblyomma parkeri

Martins, Thiago F.; Scofield, Alessandra; Oliveira, Wanessa B.L.; Nunes, Pablo H.; Ramirez, Diego G.; Barros-Battesti, Darci M.; Sá, Lilian R.M.; Ampuero, Fernanda; Souza, Julio C.; Labruna, Marcelo B.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 181-184
ENG
Relevância na Pesquisa
27.51%
The external morphology of the nymph of Amblyomma geayi Neumann is described by optical and scanning electron microscopy. Unfed nymphs were obtained from an engorged A. geayi female, which had been collected on a sloth (Bradypus variegatus) from Belém municipality, State of Pará, northern Brazil, and was kept under laboratory conditions. With the present description, we propose a modification of a taxonomic key published in 2010 for the Amblyomma nymphs that occur in Brazil, through the inclusion of A. geayi. The nymph of A. geayi is morphologically very similar to the nymph of Amblyomma parkeri Fonseca and Aragão, with only slight morphological differences related to scutal surface and punctuations (more shagreened and less punctuated in A. geayi). These 2 nymphs differ from all other known Amblyomma nymphs from Brazil by the combination of auriculae present as small posterolateral rounded projections, eyes located at the level of the scutal midlength, and a rounded hypostome. These nymphal similarities as well the morphology of the adult stage corroborate previous studies that showed that A. geayi and A. parkeri are genetically closely related. Unpublished host records of the nymphs of both A. geayi and A. parkeri are provided. Established populations of A. geayi and A. parkeri seem to be geographically separated...

A Description of the nymph of Anacroneuria ofaye (Plecoptera: Perlidae) and a rearing apparatus for rearing Neotropical stonefly species

Novaes, Marcos Carneiro; Bispo, Pitágoras da Conceição; Higuti, Janet
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 71-77
ENG
Relevância na Pesquisa
37.23%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Processo FAPESP: 2004/09711-8; Processo FAPESP: 2009/53233-7; The Neotropical genus Anacroneuria (Perlidae) is represented by more than 300 species. Among the Brazilian Anacroneuria, only the nymphs of two species have been described. In this paper, we described the nymph of A. ofaye Froehlich and an apparatus for rearing this genus. This is the first record of A. ofaye from Paraná State, Brazil.; O gênero neotropical Anacroneuria (Perlidae) é representado por mais de 300 espécies. Entre os Anacroneuria brasileiros, apenas as ninfas de duas espécies foram descritas. Neste trabalho, descrevemos a ninfa de A. ofaye Froehlich e um aparato para criação deste gênero. Este é o primeiro registro de A. ofaye no Estado do Paraná, Brasil.